-/* SPDX-License-Identifier: (GPL-2.0 or LGPL-2.1)
+/* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
*
* lttng-context-callstack-stackwalk-impl.h
*
enum lttng_cs_ctx_modes mode;
};
-static
-unsigned int (*save_func_kernel)(unsigned long *store, unsigned int size,
- unsigned int skipnr);
-static
-unsigned int (*save_func_user)(unsigned long *store, unsigned int size);
-
static
const char *lttng_cs_ctx_mode_name(enum lttng_cs_ctx_modes mode)
{
}
static
-int init_type_callstack_kernel(void)
-{
- unsigned long func;
- const char *func_name = "stack_trace_save";
-
- if (save_func_kernel)
- return 0;
- func = kallsyms_lookup_funcptr(func_name);
- if (!func) {
- printk(KERN_WARNING "LTTng: symbol lookup failed: %s\n",
- func_name);
- return -EINVAL;
- }
- save_func_kernel = (void *) func;
- return 0;
-}
-
-static
-int init_type_callstack_user(void)
-{
- unsigned long func;
- const char *func_name = "stack_trace_save_user";
-
- if (save_func_user)
- return 0;
- func = kallsyms_lookup_funcptr(func_name);
- if (!func) {
- printk(KERN_WARNING "LTTng: symbol lookup failed: %s\n",
- func_name);
- return -EINVAL;
- }
- save_func_user = (void *) func;
- return 0;
-}
-
-static
-int init_type(enum lttng_cs_ctx_modes mode)
+const char *lttng_cs_ctx_mode_length_name(enum lttng_cs_ctx_modes mode)
{
switch (mode) {
case CALLSTACK_KERNEL:
- return init_type_callstack_kernel();
+ return "_callstack_kernel_length";
case CALLSTACK_USER:
- return init_type_callstack_user();
+ return "_callstack_user_length";
default:
- return -EINVAL;
+ return NULL;
}
}
return &cs->stack_trace[buffer_nesting];
}
+static
+size_t lttng_callstack_length_get_size(size_t offset, struct lttng_ctx_field *field,
+ struct lib_ring_buffer_ctx *ctx,
+ struct lttng_channel *chan)
+{
+ size_t orig_offset = offset;
+
+ offset += lib_ring_buffer_align(offset, lttng_alignof(unsigned int));
+ offset += sizeof(unsigned int);
+ return offset - orig_offset;
+}
+
/*
* In order to reserve the correct size, the callstack is computed. The
* resulting callstack is saved to be accessed in the record step.
*/
static
-size_t lttng_callstack_get_size(size_t offset, struct lttng_ctx_field *field,
- struct lib_ring_buffer_ctx *ctx,
- struct lttng_channel *chan)
+size_t lttng_callstack_sequence_get_size(size_t offset, struct lttng_ctx_field *field,
+ struct lib_ring_buffer_ctx *ctx,
+ struct lttng_channel *chan)
{
struct lttng_stack_trace *trace;
struct field_data *fdata = field->priv;
/* do not write data if no space is available */
trace = stack_trace_context(field, ctx);
if (unlikely(!trace)) {
- offset += lib_ring_buffer_align(offset, lttng_alignof(unsigned int));
- offset += sizeof(unsigned int);
offset += lib_ring_buffer_align(offset, lttng_alignof(unsigned long));
return offset - orig_offset;
}
switch (fdata->mode) {
case CALLSTACK_KERNEL:
/* do the real work and reserve space */
- trace->nr_entries = save_func_kernel(trace->entries,
+ trace->nr_entries = stack_trace_save(trace->entries,
MAX_ENTRIES, 0);
break;
case CALLSTACK_USER:
++per_cpu(callstack_user_nesting, ctx->cpu);
/* do the real work and reserve space */
- trace->nr_entries = save_func_user(trace->entries,
+ trace->nr_entries = stack_trace_save_user(trace->entries,
MAX_ENTRIES);
per_cpu(callstack_user_nesting, ctx->cpu)--;
break;
* If the array is filled, add our own marker to show that the
* stack is incomplete.
*/
- offset += lib_ring_buffer_align(offset, lttng_alignof(unsigned int));
- offset += sizeof(unsigned int);
offset += lib_ring_buffer_align(offset, lttng_alignof(unsigned long));
offset += sizeof(unsigned long) * trace->nr_entries;
/* Add our own ULONG_MAX delimiter to show incomplete stack. */
}
static
-void lttng_callstack_record(struct lttng_ctx_field *field,
+void lttng_callstack_length_record(struct lttng_ctx_field *field,
struct lib_ring_buffer_ctx *ctx,
struct lttng_channel *chan)
{
struct lttng_stack_trace *trace = stack_trace_context(field, ctx);
unsigned int nr_seq_entries;
+ lib_ring_buffer_align_ctx(ctx, lttng_alignof(unsigned int));
if (unlikely(!trace)) {
nr_seq_entries = 0;
- lib_ring_buffer_align_ctx(ctx, lttng_alignof(unsigned int));
- chan->ops->event_write(ctx, &nr_seq_entries, sizeof(unsigned int));
- lib_ring_buffer_align_ctx(ctx, lttng_alignof(unsigned long));
+ } else {
+ nr_seq_entries = trace->nr_entries;
+ if (trace->nr_entries == MAX_ENTRIES)
+ nr_seq_entries++;
+ }
+ chan->ops->event_write(ctx, &nr_seq_entries, sizeof(unsigned int));
+}
+
+static
+void lttng_callstack_sequence_record(struct lttng_ctx_field *field,
+ struct lib_ring_buffer_ctx *ctx,
+ struct lttng_channel *chan)
+{
+ struct lttng_stack_trace *trace = stack_trace_context(field, ctx);
+ unsigned int nr_seq_entries;
+
+ lib_ring_buffer_align_ctx(ctx, lttng_alignof(unsigned long));
+ if (unlikely(!trace)) {
return;
}
- lib_ring_buffer_align_ctx(ctx, lttng_alignof(unsigned int));
nr_seq_entries = trace->nr_entries;
if (trace->nr_entries == MAX_ENTRIES)
nr_seq_entries++;
- chan->ops->event_write(ctx, &nr_seq_entries, sizeof(unsigned int));
- lib_ring_buffer_align_ctx(ctx, lttng_alignof(unsigned long));
chan->ops->event_write(ctx, trace->entries,
sizeof(unsigned long) * trace->nr_entries);
/* Add our own ULONG_MAX delimiter to show incomplete stack. */